body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

.container {
  display: flex;
  margin-top: 0px;
}

.sidebar {
  background-color: #358;
  width: 150px;
  padding: 20px;
  height:593px;
}

.sidebar ul li:nth-child(2) {
  background-color: #679;
  border-radius: 10px;
}

.sidebar ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  margin-top: 100px;
}

.sidebar ul li {
  margin-bottom: 15px;
}

.sidebar ul li a {
  text-decoration: none;
  color: #eee;
  display: block;
  text-align: center;
  padding: 10px;
}

.content {
  flex-grow: 1;
  padding: 20px;
  margin-top: 0px;}

.head {
  font-size: 25px;
  text-align: center;
  margin-left: 10px;
  font-weight: 700;
}

.info {
  margin-top: 40px;
  background-color: #f2f2f2;
  padding: 20px;
  margin-left: 70px;
  margin-right: 10px;
  height: auto;
  width: 820px;
  border-radius: 10px;
}


.grade-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

.grade-table th,
.grade-table td {
  padding: 8px;
  text-align: center;
  border: 1px solid #ccc;
}

.grade-table th {
  background-color: #ddd;
  color: #333;
}

.grade-table tr:nth-child(even) {
  background-color: #fff;
}

.grade-table tr:nth-child(odd) {
  background-color: #f6f6f6;
}

.centered {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20px;
}

.anniu {
  height: 30px;
  width: 70px;
  margin-top: 16px;
  margin-left: 650px;
}

#subBtn {
   margin-left:15px;
}

input[type="text"] {
  width: 40px; /* 设置宽度为200像素 */
  height: 16px; /* 设置高度为30像素 */
  text-align: center; /* 将文本居中对齐 */
}

input[type="text2"] {
  width: 100px; /* 设置宽度为200像素 */
  height: 16px; /* 设置高度为30像素 */
  text-align: center; /* 将文本居中对齐 */
}